not refering to gastrointestinal problems...

seriously...after I fill up the tank the pickup on my 8 seems kind of sluggish...after driving for a few miles the problem goes away

I always use 92 or higher octane at reputable locations and this has occurred at varying temperatures (it is not the 'cold engine syndrome' thing)

anyone know what is up?

 

The car takes a while getting used to lugging the extra weight from filling the gas tank up? :D. j/k

I have not noticed this with my car.

 

the weight was my first guess actually

 

holy **** I worked it out...and know I know why drifters use a tiny gas tank:

one gallon of gas weighs approximatly 6 pounds...when I let my tank get to a quarter full I need to fill up 12 gallons to fill it up...that is 70 pounds...that could make a noticable difference...am I right autoxers?

 

You'd have the same sluggish feeling when hauling passengers around ............ have you noticed the "gassed up" feeling when you're not alone?

You also mentioned the problem going away after driving a few miles ........... how many gallons per mile are you using? :D.

 

I'll start keeping track of the MPG...right now I just close my eyes at the pump and pay the bill blindly in the mail

I've never thought about it when passengersare in the car but I'll be paying attention now

 

are you sure abotu that density?? sounds pretty high to me.

it's apparently 727.22 kg/m^3 (and 1L is 10x10x10), which is 727.22 kg/1000L, which is 0.727 kg/L, which is 72.7% of water.

0.727kg into pounds is about 1.6 pounds/L. 1 US gallon (which is what i assume you're using) is 3.78L, so one gallon of gasoline is indeed 6 lbs/ga. higher than i figured it'd be, but fair enough.

 

Funny. Mine performs worse with a close-to-empty tank than with a full. But every car I've ever driven seems to do better with a full tank than anything else.